The Insignia, introduced to replace the much-maligned Vectra, has surprised many within the industry by reaching the top five best-selling models in the UK.
The top ten best selling cars are usually taken up by a variety of smaller superminis and hatchbacks, with the Ford Fiesta, Vauxhall Corsa, Vauxhall Astra, Ford Focus, Volkswagen Golf, Mini and Peugeot 207 all making it into the top ten.
"The Insignia’s appeal to retail customers illustrating how well regarded Vauxhall is becoming among brands in the premium sector," said Aldred, who was pleased to see the Insignia sell well since the new ’60’ plates were introduced.
"September is obviously a crucial month for car sales. Yet again, models like the Insignia and Astra have proved immensely popular to a broad cross-section of buyers."
The mid-size Insignia saloon and estate models dominated its segment, taking nearly a fifth of all sales and outselling the popular Ford Mondeo in the process.
The Insignia which was awarded the European Car of the Year in 2009, the first time a GM car had picked up the award since 1987, when the Omega took the title.
Options such as air conditioning, cruise control and a CD player comes as standard on all models, and there is a wide choice of trim levels adding features such as alloy wheels, front fog lights, satellite navigation and rain-sensing windscreen wipers.
Vauxhall’s Insignia is available in four-door saloon, five-door hatchback and sports tourer guise and costs from £18,925, £17,120 and £18,470 respectively.
Aldred also praised Vauxhall’s commercial vehicles operations after its market share increased to one of its best ever totals.
"The new Movano has also given our CV sales a real boost, helping us achieve one of our best retail market shares ever, totalling 17.77 per cent," he said.